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For the duration of the flash sale, and courtesy of a Topcashback “secret offer”, you will receive a massive 15% cashback (specifically, 15.15% to 15.75%).
If you add that to the already heavily discounted rates that are in many cases available, plus the points you will earn on the stay anyway (Hilton are of course currently running a double points promotion) bargains are definitely available here.
Note that to benefit from the boosted cashback rate, you will have to follow the specific “secret offer” link, which is here. Otherwise your cashback will be at 12%.
(With thanks to Andrew H)